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1.发明公开
公开(公告)号：EP4148942A1
公开(公告)日：2023-03-15
申请号：EP22185955.6
申请日：2017-09-28
Applicant: Huawei Technologies Co., Ltd.
Inventor： YUAN, Hongwen , XU, Fuqiang , LIU, Fangcheng
Abstract: A method for synchronizing PWM control signals of inverters, an inverter, and a power grid system are disclosed, so that PWM control signals of inverters connected to a power grid can be synchronized A direct current voltage terminal of the inverter is connected to an external power supply, and an alternating current voltage terminal of the inverter is connected to an alternating current point of common coupling of a power grid and the method includes: obtaining a phase 0 of an alternating current voltage of the power grid (S101); determining a time period during which the phase of the alternating current voltage varies within a preset phase threshold interval, when it is detected that the phase of the alternating current voltage has reached a phase threshold (S102), where the phase threshold is a start phase of the preset phase threshold interval; calculating a period of a preset carrier wave based on a preset carrier wave ratio and the time period (S103); generating the preset carrier wave based on the period of the preset carrier wave (S104); and generating a PWM control signal of the inverter based on a PWM modulation signal and the preset carrier wave (S105).
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2.发明公开
公开(公告)号：EP3681007A1
公开(公告)日：2020-07-15
申请号：EP17926771.1
申请日：2017-09-28
Applicant: Huawei Technologies Co., Ltd.
Inventor： YUAN, Hongwen , XU, Fuqiang , LIU, Fangcheng
Abstract: A method for synchronizing PWM control signals of inverters, an inverter, and a power grid system are disclosed, so that PWM control signals of inverters connected to a power grid can be synchronized. A direct current voltage terminal of the inverter is connected to an external power supply, and an alternating current voltage terminal of the inverter is connected to an alternating current point of common coupling of a power grid, and the method includes: obtaining a phase θ of an alternating current voltage of the power grid (S101); determining a time period during which the phase of the alternating current voltage varies within a preset phase threshold interval, when it is detected that the phase of the alternating current voltage has reached a phase threshold (S102), where the phase threshold is a start phase of the preset phase threshold interval; calculating a period of a preset carrier wave based on a preset carrier wave ratio and the time period (S 103); generating the preset carrier wave based on the period of the preset carrier wave (S104); and generating a PWM control signal of the inverter based on a PWM modulation signal and the preset carrier wave (S105).
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